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using a barlow

Started by mnevitt, 05/16/2009 04:36PM
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Posted 05/16/2009 04:36PM Opening Post
Mark Nevitt
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Location: Middlesex NJ, US

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Does using a barlow change the size of the airy disk produced by a refractor. If you put a 2x barlow in an f/10 scope does it produce an airy disk of the same diameter as a f/20 scope of the same aperture

Mark
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Posted 05/16/2009 05:49PM #1
Magnus Ahrling
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Hi Mark!

No, the airydisc is a result of a given aperture alone.

-Magnus
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